My own suggestion: Slamtilt. Fabulous, fast, furry fun. Up to 8 players showing their pinball prowess. Although being keyboard-controlled, a hell of a lot of seat-swapping is required. Same true of Worms, unless it's CD32 Worms, with CD32 pad control.

All great games so far! (Although I freely admit to not being all that great at Speedball 2. But I do hold a Masters in Super Skidmarks).